Work-clamp for bulldozers and like presses



J. LUKASZEWSKI.

WORK CLAMP FOR BULLDOZERS AND LIKE PRESSES.

Patented June 21, `1921.

APPLICATIDN HLED MAY291920.

UNITED STATES PATENT ori-Ica JOZEPH LUKASZEWSKI, OF HAMMOND, INDIANA.

WORK-CLAIVII FOR BULLDOZERS AND LIKE PRESSES.

Application led May 29,

To all 1li/1,0111. t may concern.'

Be it known that I, Joznrir LUKAsZnwsKr, a citizen of the present Government of Poland, and a resident'of Hammond, Lake county, and State of Indiana, have invented certain new and useful Improvements in lVork-Clamps -for Bulldozers and like Presses, of which the following is declared to be a full, clear, and eXact description.

This invention relates to improvements in work clamp for bulldozers and like presses and it has been designed especially for use in connection with presses for operating on heavy work, such as bulldozers and hydraulic presses. It is inconvenient, diflicult, and dangerous to hold the work in proper position before the dies of such presses are brought together upon the work, and the object of this invention is to provide improved means for temporarily holding the work in place. Another object is to provide clamping means capable of temporarily holding material of various thicknesses in place, and which may be readily adjusted to accommodate itself to different thicknesses of material.

lVith these and other objects in view, the invention consists in the several novel features hereinafter fully set forth and claimed.

The invention is clearly illustrated in the accompanying drawing, in which Figure 1 is a plan of a fragment of the table, and the dies of a bulldozer of ordinary construction, illustrating a simple form of the present invention applied thereto; Fig. 2 is a view partly in side elevation and partly in vertical, longitudinal section of the parts seen in Fig. 1, the line of section being indicated at 22 in Fig. 1, and Fig. 3 is a detail side view of a certain clamp member showing an adjusting member thereof in section.

Referring to said drawing, which illustrates a simple embodiment 0f the invention, the reference character 4l designates a fragment of the table, 5 the stationary die and 6 the movable die of a bulldozer of usual and ordinary construction. The stationary die 5 is bolted or otherwise rigidly fastened to the table, and the movable die 6 is secured to a plunger or head 7 which is operated by suitable mechanism, as is well understood, to press or form the material into shape between the dies. For convenience in illustrating the invention, dies for forming up the yoke member of a ,ar coupling, are

Specification of Letters Patent.

Patented June 21, 1921.

1920. Serial No. 385,119.

shown, the working end 8 of the stationary die 5 being substantially rectangular, and the movable die having a rectangular recessed portion 9 that cooperates with the portion 8 to form, or shape the work or material (A) between them, as is well understood.

In common practice the preheated bar A, is placed against the end face 10 of the stationary die 5, held there in some fashion, and the movable die 6 forcibly brought against the bar by the powerful operating mechanism ofthe press or bulldozer; and the end portions of the bar thereupon bent back along the side of the die 5.

The clamping mechanism forming the subject matter of this invention, comprises a clamp member 11, which is fulcrumed on a post or standard 12, and an operating lever 13, also fulcrumed on the post 12 and connected to the clamp member 11 bylinks 1%. The fulcrum 15 of theclamp memberll is located back of the end face 10 of the stationary die. to permit the clamp'member to be moved substantially in avertical direction, to and from its operative position, and a bearing face 16 provided on a portion 17 of the clamp member' which face 16 is arranged to engage the bar or other material, to be operated on by the press. The clamp member may be swung up to the position seen dotted lines in Fig. 9., to permit the bar A or other material, to be put in pla-ce against the stationary die, and the operating lever 13 is used to lift and lower the clamp member-11.

The' post or standard 12 may conveniently comprise two spaced, companion members bolted to the upper face of the stationary die, andthe clamp member 11, and operating lever 13 may pass between said members. Said lever 13 has a long handle 18. distantly located from the jaw V1'?, that may be in convenient position to be grasped and operated by the workmen, without exposing themselves to the dangers of the press. The short arm 19 of the lever overlies the clamp member and is connected thereto by the links 14.

To accommodate the clamp member to thick or thin bars or other material to be formed or shaped by the press, said member is made adjustable, whereby the clamp-`r thev face 16 of the may be brought into parallel relation with therend face of` the die 5 at the clamping position ofthe jaw, whereby the `bar or other work A may be securely clamped in place. A simple forni of adjustment means for the clamp member may be obtained by making it in two parts 20. 2l see Fie. 3 each havin@ a screw,

f E? 7 C threaded ,end 23, 24, one being a right and one being a left hand thread, connected by an internally screw threaded coupling 125. By turning tlie coupling in theV proper direction, the space between the farces l0, 16 'may be increased or decreased at will. The bear ing face of thejaw portion 17 is arranged at Aright angles to the length of the shank portion and the pivotal connection betweenV the shank portion and its support is Yarranged back of the place where the jawengages the work, whereby verysliglit effort is required to clamp the work in place, 'and yet theV clamping action is lvery effective befV in Fig. l to thatseen inV dotted lines, andr then back again to its former position, there- Vby forming or shaping up the bar as is well understood. p lt will be readily seen that the hotbar may be heldV inposition without. any great effort on behalf ,oftlie'opeiaton Vand with-v out exposing himself .to the dangers of the press. p

. It is also understood that the In operation, the bar A or other material clamp is iiitended for use in connection with comparatively heavy work, and that itis made of strong and substantial material, capable of lrough handling;

More or less variation of the exact details of construction is possible without departing from the spirit ofv this invention; I desire,

therefore, not to limit myself to the exact foimof the construction shown and described, but intend, in the following claims. to point out all of the invention disclosed herein. Y

I claimV as new, and desire to secure by Letters Patent: y

l. A work clampV of the cha acter described, for bulldozers and like presses, comprising a clamp member having a shank portion proificlecljvith a jaw. at one end thereof forclamping the work against one die of the press, the bearing face offsaid j aw being arranged at right angles to the length ofthe shank of the clamp member, a support, said clamp member being fulcrumed on said support at a` point back of the work, an` operating lever fulcrumed on said support. and having a handle distantly removed from said jaw, and operative connections between said clamp member and lever. Y .2.-A work clamp ofthe character described for bulldozers and like presses. com- Y prising a clamp member having a shank pory tion provided with a jaw at one end thereof for clamping the lwork against one die of the press, th'ebearingface of said aw being arranged at right angles Ato the length of the shank of the clamp member, a` support located back ofsaid jaw, said clampY member being fulcrumed on said support at a point back-of said jam-an operating lever fulcrumedon said support and havinga handle distantly removed from the jaw, and a link connecting said clamp'member and lever.

-Joznrii LUin-i'sznwsii. 

